Bosch dishwashers are efficient and durable, but they can still have errors. A common problem is the E02 error code. This usually means there’s a fault in the heating circuit or the power control module. If your Bosch dishwasher is showing this error, don’t worry.
This guide will help you diagnose and fix the E02 error. You will get your dishwasher running smoothly again.
What Does Bosch Dishwasher Error Code E02 Mean?
The E02 error code in Bosch dishwashers usually points to a fault in the heating element or the power control module (PCB). The dishwasher relies on a properly functioning heating system to warm water for effective cleaning. When this system malfunctions, the appliance displays the E02 error.
Common Causes of E02 Error:
- Faulty Heating Element – The heating element is responsible for warming the water. If it malfunctions, the dishwasher won’t heat properly.
- Defective Power Control Module (PCB) – The PCB regulates electrical components, including the heating element.
- Wiring Issues – Loose or damaged wiring can prevent the heating element from receiving power.
- Thermistor (NTC Sensor) Failure – If the temperature sensor is faulty, it may incorrectly signal the control board.
- Burnt Relay on the Circuit Board – A damaged relay may interrupt power to the heater.
How to Fix Bosch Dishwasher Error Code E02
Step 1: Reset Your Dishwasher
Before diving into complex repairs, try resetting your dishwasher.
- Turn off the dishwasher and unplug it from the power source.
- Wait for 10-15 minutes to allow the system to reset.
- Plug it back in and turn it on to check if the error persists.
If the error remains, proceed with troubleshooting.
Step 2: Check the Heating Element
The heating element is responsible for warming the water. A faulty element can trigger the E02 error.
Tools Needed:
- Multimeter
- Screwdriver
Steps to Test the Heating Element:
- Disconnect Power: Unplug the dishwasher to avoid electrical shock.
- Access the Heating Element: Remove the bottom panel or access panel.
- Inspect for Visible Damage: Look for burns or cracks on the heating coil.
- Use a Multimeter: Set it to resistance mode and place the probes on the heating element terminals.
- A working heating element should show a resistance reading of 15-30 ohms.
- If the reading is infinite (OL) or zero, the heating element is faulty and needs replacement.
Step 3: Inspect the Power Control Module (PCB)
The PCB (printed circuit board) controls the electrical components. If it fails, the heating element won’t receive power.
How to Check the PCB:
- Remove the Dishwasher Panel: Locate the control board inside the dishwasher door.
- Check for Burn Marks: Look for burnt components or damaged relays.
- Test Relays and Connections: Use a multimeter to test the continuity of the relays.
- Replace PCB if Necessary: If the relays or circuits are damaged, replacing the control module is the best solution.
Step 4: Check the Thermistor (NTC Sensor)
The thermistor (NTC sensor) measures water temperature. If it malfunctions, the dishwasher may not heat properly.
Testing the Thermistor:
- Locate the thermistor near the heating element.
- Use a multimeter to test resistance.
- At room temperature (25°C), it should read around 50K ohms.
- If readings are inconsistent, replace the thermistor.
Step 5: Inspect the Wiring & Connections
Loose or burnt wiring can prevent power from reaching the heating system.
How to Check for Wiring Issues:
- Turn off the dishwasher and unplug it.
- Remove the lower access panel and locate the wiring connections.
- Check for loose or burned wires.
- Use a multimeter to test continuity. If broken, replace the damaged wires.
Case Study 1: DIY Fix on Bosch 800 Series Dishwasher
A Reddit user in r/appliancerepair experienced the E02 error on a Bosch 800 series dishwasher. The dishwasher wasn’t heating, and the control panel flickered. After testing:
- The heating element failed the continuity test.
- The power module showed burnt contacts.
- A replacement control board ($167) fixed the issue.
Case Study 2: DIY Fix on Bosch Serie 4 Dishwasher
A user on DIYnot Forums had an E02 error and discovered that:
- The heating relay was defective.
- Soldering a new relay onto the PCB fixed the issue without replacing the control board.
Frequently Asked Questions (FAQs)
Can I Continue Using My Dishwasher with an E02 Error?
No. The E02 error shows there’s a heating problem. This can cause poor cleaning and may harm components.
Can I fix Bosch Dishwasher Error E02 myself?
Yes, if you’re comfortable with basic electrical testing (multimeter use). If you suspect a faulty PCB, consider hiring a professional.
How Much Does It Cost to Fix a Bosch Dishwasher E02 Error?
- DIY Fix: Heating element replacement $50-$100.
- Professional Repair: Labor costs range from $150-$300, depending on the issue.
- Control Module Replacement: $200-$400, including parts and labor.
How Can I Prevent the E02 Error in the Future?
- Regularly clean the dishwasher filter to prevent clogs.
- Inspect heating elements and wiring annually.
- Use high-quality dishwasher detergent to reduce buildup.
- Avoid overloading the dishwasher to prevent excessive strain on components.
Final Thoughts
The Bosch Dishwasher E02 error usually means there’s a problem with the heating element, power control module, or wiring. By following this troubleshooting guide, you can diagnose and fix the issue efficiently. If the problem persists, consult a certified technician to avoid further damage.
Pro Tip: If your dishwasher is over 7-10 years old, replacing it might be more cost-effective than repairing it.
